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Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner

[Image: see text] The combustion characteristics and NOx emissions of a newly designed flue gas internal recirculation low-NOx burner (FIR) were studied. In the study, experimental and numerical simulations of the FIR low-NOx burner were conducted under natural inlet air conditions at three differen...

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Autores principales: Zhang, Lianjie, Wu, Chenghao, Zhang, Jianghui, Zhang, Bin, Sui, Chunjie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9686195/
https://www.ncbi.nlm.nih.gov/pubmed/36440137
http://dx.doi.org/10.1021/acsomega.2c05062
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author Zhang, Lianjie
Wu, Chenghao
Zhang, Jianghui
Zhang, Bin
Sui, Chunjie
author_facet Zhang, Lianjie
Wu, Chenghao
Zhang, Jianghui
Zhang, Bin
Sui, Chunjie
author_sort Zhang, Lianjie
collection PubMed
description [Image: see text] The combustion characteristics and NOx emissions of a newly designed flue gas internal recirculation low-NOx burner (FIR) were studied. In the study, experimental and numerical simulations of the FIR low-NOx burner were conducted under natural inlet air conditions at three different powers. Results show that the fuel inlet strongly influences the jet effect, thus influencing the flue gas recirculation rate, flame stability, and NOx emissions. With a medium power of 20 kW, the NOx emission of a FIR low-NOx burner is lower than 30 mg/N m(3). Higher or lower power will increase the NOx emissions or induce combustion instability. The swirling flow and bluff body structure can effectively improve the combustion stability. Three dominant frequencies of 54, 264, and 448 Hz can be observed from the power spectral densities of axial velocity, corresponding to the shedding vortex in the shear layer, the swirl frequency of processing vortex core (PVC), and the vortex induced by the PVC structure, respectively. The influences of vortex shedding and PVC structure are weak and inadequate to affect the overall flame stability.
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spelling pubmed-96861952022-11-25 Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner Zhang, Lianjie Wu, Chenghao Zhang, Jianghui Zhang, Bin Sui, Chunjie ACS Omega [Image: see text] The combustion characteristics and NOx emissions of a newly designed flue gas internal recirculation low-NOx burner (FIR) were studied. In the study, experimental and numerical simulations of the FIR low-NOx burner were conducted under natural inlet air conditions at three different powers. Results show that the fuel inlet strongly influences the jet effect, thus influencing the flue gas recirculation rate, flame stability, and NOx emissions. With a medium power of 20 kW, the NOx emission of a FIR low-NOx burner is lower than 30 mg/N m(3). Higher or lower power will increase the NOx emissions or induce combustion instability. The swirling flow and bluff body structure can effectively improve the combustion stability. Three dominant frequencies of 54, 264, and 448 Hz can be observed from the power spectral densities of axial velocity, corresponding to the shedding vortex in the shear layer, the swirl frequency of processing vortex core (PVC), and the vortex induced by the PVC structure, respectively. The influences of vortex shedding and PVC structure are weak and inadequate to affect the overall flame stability. American Chemical Society 2022-11-14 /pmc/articles/PMC9686195/ /pubmed/36440137 http://dx.doi.org/10.1021/acsomega.2c05062 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Zhang, Lianjie
Wu, Chenghao
Zhang, Jianghui
Zhang, Bin
Sui, Chunjie
Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner
title Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner
title_full Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner
title_fullStr Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner
title_full_unstemmed Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner
title_short Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner
title_sort numerical simulation of the combustion characteristics in a flue gas internal recirculation burner
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9686195/
https://www.ncbi.nlm.nih.gov/pubmed/36440137
http://dx.doi.org/10.1021/acsomega.2c05062
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